What is interrupt nesting in embedded systems?

Interrupt nesting in embedded systems refers to the ability of a higher-priority interrupt to preempt a currently executing lower-priority interrupt service routine (ISR). This mechanism allows the system to respond more quickly to critical events, ensuring that time-sensitive tasks are prioritized. However, it also adds complexity to the system, requiring careful management of the interrupt priorities and stack to prevent issues like stack overflow or increased latency in handling lower-priority interrupts. Properly implemented, interrupt nesting can significantly enhance the responsiveness and efficiency of real-time applications.